From: Martin DeMello <martindemello@...>
Date: 2006-08-16T00:23:36+09:00
Subject: Re: special characters within [] in a regexp

On 8/15/06, Carlos <angus@quovadis.com.ar> wrote:
> Martin DeMello wrote:
> > What characters have to be escaped within a [] in a regular
> > expression? I was a bit taken aback by the following:
> >
> > irb(main):001:0> a = '!#$%^&*((*)*_GHF$%#$*^%&;2~__)+|{}|{\\'
> > => "!\#$%^&*((*)*_GHF$%\#$*^%&;2~__)+|{}|{\\"
> > irb(main):002:0> a.gsub(/[!@#$%^&*+={}|\\]/, '_')
> > SyntaxError: compile error
> > (irb):2: parse error, unexpected $undefined.
> > a.gsub(/[!@#$%^&*+={}|\\]/, '_')
> >             ^
> > (irb):2: parse error, unexpected $undefined.
>
> Hi. You don't need braces to interpolate global variables. "#$%" tries
> to interpolate special variable $%.

Oh! Okay, I get it now :) Thanks.

martin
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